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Equal Sets

definition

Definition: Two sets A and B are said to be equal if they have exactly the same elements and we write A = B. Otherwise, the sets are said to be unequal and we write A ≠ B. 

notes

Given two sets A and B, if every element of A is also an element of B and if every element of B is also an element of A, then the sets A and B are said to be equal. Clearly, the two sets have exactly the same elements.
Example- A= {a, b, c, d} and B = {d, c, b, a} are equal sets.

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